karthik_feb12 Member Member since Feb 4, 2007 Last active Mar 20, 2007 Total activities 0 Activity feed Recent contributions #Threads 19 years ago 443eb891-34b4-40ac-9cd0-e4a78dbba6df just get the diameter of tube and shell from TUBULAR MANUFACTURERS ASSOCIATION(TEMA) BOOK and fabricate!! going to make helical tube or parallel...